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          Servlet的中请求体和响应体HttpServletResponse接口1.介绍
 HttpServletResponse接口，来自于Servlet规范
 HttpServletResponse接口，由Tomcat服务器厂商提供
 HttpServletResponse接口，可以将Servlet中的运行结果写入到响应包
 HttpServletResponse接口修饰的对象，通常称为【响应对象】
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          Servlet规范上1.Servlet规范介绍
Servlet规范是sun公司提供
Servlet规范是指动态资源文件的调用管理规则
Servlet规范涉及的接口实现类由http厂商提供
tomcat对于Servlet规范提供的接口实现类在lib/servelet-api.jar

2.Servlet规范细节
指定了Servlet接口实现类的开发步骤
指定了Tomcat调用接口实现类的规则
指定了
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          Tomcat 服务器基本玩法
由Apache组织提供的一种Web服务器，提供对jsp和Servlet的支持。它是一种轻量级的javaWeb容器（服务器），也是当前应用最广的JavaWeb服务器（免费）。

其他常见的web服务器

Jboss：是一个遵从JavaEE规范的、开放源代码的、纯Java的EJB服务器，它支持所有的JavaEE规范（免费）。
GlassFish： 由Oracle公司开发的
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          JDBC的封装1.基于流程封装Dao
通常对数据库表的操作细节，增删改查或者其他的业务处理，封装成一个Dao(database access object)类，然后我们每次操作这个表，就不要考虑里面的细节，只需要考虑我们的业务就可以了

package Dao;

import java.sql.Connection;
import java.sql.DriverManager;
import j
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        <a href="/posts/32544/">JavaWeb之JDBC基础学习</a>
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          JavaWeb之JDBC基础学习JDBC概念和出现的原因
JDBC：Java数据库连接（Java DataBase Connectivity），是Java语言中用来规范客户端如何程序如何来访问数据库的**应用程序接口(API)**，提供了诸如查询和更新数据库中数据的方法。


但是我们知道市面上的DBMS不止一个，如MySQL、Oracle、DB2、SQLite。当我们使用MySQL时，需要写操作
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        <a href="/posts/52151/">Java中的多线程-上</a>
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          Java中的多线程上1.多线程概述一个单核的CPU,理论上只能调用一个进程去执行应用，但是通常我们单核的电脑也能同时运行多个软件应用，这是因为CPU有一个频率，它使得单位时间内，这个进程在多个应用之间切换调用，

当我们执行Java程序的时候，是一个进程来执行我们的Java程序，一个进程至少包含一个主线程，内部的任务还是由线程完成，在Java中我们的主线程一般是我们的main方法,当然也可以有更多
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        <a href="/posts/4351/">
          
          
            
          
          集合基本概念首先我们需要了解什么是集合？

集合简称集，主要就是用于存储多个元素的容器,在编程中，常常需要集中存放多个数据。
从传统意义上讲，数组是我们的一个很好的选择，前提是我们事先已经明确知道我们将要保存的对象的数量。一旦在数组初始化时指定了这个数组长度，这个数组长度就是不可变的.
如果我们需要保存一个可以动态增长的数据(在编译时无法确定具体的数量)，java的集合类就是一个很好的设计方案了。
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        <a href="/posts/60410/">Java中的IO 下</a>
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        <a href="/posts/60410/">
          
          
            
          
          Java中的IO Part 2处理流
上面讲解的普通流是逐个字节进行输入或输出，这样虽然可以完成工作，但是在效率上有很大的问题。当我们将文件读取的时候，会先加载到内存，然而刚刚加载了一个字节到内存，马上又要告诉磁盘，喂大兄弟，给我把这个字节写到磁盘上，我们知道磁盘的效率比内存要低很多的，在磁盘写入的过程中，内存只能干瞪眼，当磁盘写完一个字节后，内存再把下一个字节交给磁盘，喂大兄弟，继续写下一个，然
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        <a href="/posts/11067/">Java中的IO 上</a>
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          Java中的IO Part 1IO概念（Input/Output）
对于任何程序设计语言而言，输入输出(I/0)系统都是比较复杂的而且是比较核心的。程序运行需要数据，数据的获取往往需要跟外部系统进行通信，外部系统可能是文件、数据库、其他程序、网络、IO设备等等。我们可以发现，外部系统比较复杂多变，那么我们有必要通过某种手段进行抽象、屏蔽外部的差异。我们希望通过某种技术实现对所有外部系统的输入输出操
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              2021-02-16
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        <a href="/posts/30408/">Java中的File类</a>
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          Java的File类
Java文件类以抽象的方式代表文件名和目录路径名。该类主要用于文件和目录的创建、文件的查找和文件的删除等。File类在java.io包里。


说的通俗易懂就是，file就是指一个文件或文件夹，文件及文件夹的创建、删除需要用到它，可以通过他获取文件的各种信息，但是不能获取文件的内容！！要获取文件的内容需要用到其他的类。

1.File类的构造器
通过查看源码，共有6个构造方法
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